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450 Chairs total.

15 rows of 20 chairs already set up
15 * 20 = chairs already set up
300 chairs already set up

Chairs remaining = 450 -300 = 150 chairs still need to be set up.

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Q: A man sets up 450 chairs in a large hall there are 20 chairs in each row and there are already 15 rows set up how many more chairs does he have to set up?
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